jakelazaroff.com
open graph real easy
Improve line wrapping
author
Jake Lazaroff
date
(May 29, 2026, 8:52 PM -0400)
commit
30ccc190
30ccc190bed5a8b07d0ef8a23eb801fbe0775951
parent
488eccdd
488eccdda3efeb9abad5419e7a5a71f379cf9fa2
+36
-9
+36
-9
internal/render/render.go
+36
-9
internal/render/render.go
···
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baselineAnchor := layer.Anchor == "baseline"
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metrics := face.Metrics()
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-
if layer.WrapWidth > 0 {
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dc.DrawStringWrapped(txt, x, y, ax, ay, layer.WrapWidth, 1.5, gg.AlignLeft)
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return nil
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+
var lines []string
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for _, segment := range strings.Split(txt, "\n") {
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if layer.WrapWidth > 0 {
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lines = append(lines, wrapText(face, segment, layer.WrapWidth, layer.Spacing)...)
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} else {
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lines = append(lines, segment)
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}
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}
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lines := strings.Split(txt, "\n")
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lineH := layer.Size * 1.2
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totalH := float64(len(lines)-1) * lineH
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for i, line := range lines {
···
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baselineY = lineY + metrics.Ascent - ay*boxH
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}
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n := utf8.RuneCountInString(line)
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totalW := face.Advance(line)
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if n > 1 {
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totalW += layer.Spacing * float64(n-1)
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}
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totalW := measureLine(face, line, layer.Spacing)
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drawLine(dc, face, line, x-ax*totalW, baselineY, layer.Spacing)
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}
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return nil
···
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dc.DrawImageEx(img, gg.DrawImageOptions{X: imgX, Y: imgY, DstWidth: dstW, DstHeight: dstH, Opacity: opacity})
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return nil
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}
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func measureLine(face text.Face, s string, spacing float64) float64 {
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n := utf8.RuneCountInString(s)
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w := face.Advance(s)
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if n > 1 {
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w += spacing * float64(n-1)
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}
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return w
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}
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func wrapText(face text.Face, s string, maxWidth, spacing float64) []string {
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words := strings.Fields(s)
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if len(words) == 0 {
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return []string{""}
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}
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var lines []string
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current := words[0]
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for _, word := range words[1:] {
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candidate := current + " " + word
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if measureLine(face, candidate, spacing) > maxWidth {
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lines = append(lines, current)
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current = word
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} else {
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current = candidate
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}
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}
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return append(lines, current)
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}
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// drawLine draws a single pre-positioned line at the given baseline.